Journalartikel

Jahr der Veröffentlichung: 2016

Seiten: 5865-5872

Zeitschrift: ACS Catalysis

Bandnummer: 6

Heftnummer: 9

ISSN: 2155-5435

eISSN: 2155-5435

Open Access Status: Hybrid

DOI Link: https://doi.org/10.1021/acscatal.6b00829

Verlag: American Chemical Society

Abstract: 
A series of microstructured, supported platinum (Pt) catalyst films (supported on single-crystal yttria-stabilized zirconia) and an appropriate Pt catalyst reference system (supported on single-crystal alumina) were fabricated using pulsed laser deposition and ion-beam etching. The thin films exhibit area specific lengths of the three-phase boundary (length of three-phase boundary between the Pt, support, and gas phase divided by the superficial area of the sample) that vary over 4 orders of magnitude from 4.5 X 10(2) to 4.9 X 10(6) m m(-2), equivalent to structural length scales of 0.2 mu m to approximately 9000 mu m. The catalyst films have been characterized using X-ray diffraction, atomic force microscopy, high-resolution scanning electron microscopy, and catalytic activity tests employing the carbon monoxide oxidation reaction. When Pt is supported on yttria-stabilized zirconia, the reaction rate clearly depends upon the area-specific length of the three-phase boundary, l(tpb). A similar relationship is not observed when Pt is supported on alumina. We suggest that the presence of the three-phase boundary provides an extra channel of oxygen supply to the Pt through diffusion in or on the yttria-stabilized zirconia support coupled with surface diffusion across the Pt.

Harvard-Zitierstil: Papaioannou, E., Bachmann, C., Neumeier, J., Frankel, D., Over, H., Janek, J., et al. (2016) Role of the Three-Phase Boundary of the Platinum-Support Interface in Catalysis: A Model Catalyst Kinetic Study, ACS Catalysis, 6(9), pp. 5865-5872. https://doi.org/10.1021/acscatal.6b00829

APA-Zitierstil: Papaioannou, E., Bachmann, C., Neumeier, J., Frankel, D., Over, H., Janek, J., & Metcalfe, I. (2016). Role of the Three-Phase Boundary of the Platinum-Support Interface in Catalysis: A Model Catalyst Kinetic Study. ACS Catalysis. 6(9), 5865-5872. https://doi.org/10.1021/acscatal.6b00829